Prerequisites
The following are the prerequisites for configuring Toll Fraud prevention with Unified CME:
Prerequisites for Configuring Toll Fraud Prevention on Trunk Side
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Cisco Unified CME 8.1 or a later version.
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Cisco IOS Release 15.1(2)T.
Prerequisites for Configuring Toll Fraud Prevention for Line Side SIP
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Unified CME 12.6 or a later version.
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Cisco IOS XE Gibraltar Release 16.11.1a or later.